I’d agree that removing a mold shouldn’t have been enough to cause an implant to fail, presuming it had properly fused with your jawbone. Ask your dentist to explain why the implant failed, whether they think it could have become infected or had failed to bond with your jawbone, or if it failed for some other reason. They will have your medical history and your x-rays and CT scan, so they should be able to work out what went wrong. Have they suggested reinstalling the implant? This is often possible once the site has healed. Otherwise, get a second opinion from another implant dentist.